Axle typhoon ax-p400l (400W) PSU Dead
Hi people 
I came here looking for helps I saw how you guys helped for PSU repairs. Let me tell you my story
I have an Axle typhoon ax-p400l PSU which is 400W but suddenly it stopped working because of a lightning strike which came from Network port.
You may have not heard of this PSU, it's a Chinese made PSU not a high end one like expensive ones over there, but it did me a decent job.
Computer was intact but is PSU dead.
I checked it with my digital multimeter and I saw all the cables have power but it was very low. Like around 2V from 12V cable and etc.. Everything I measured had similar problem. All the pins were around 2V or lower.
So I disassembled the PSU and saw only a 10 ohms resistor was burned but still worked with a burning smell. This resistor is connected to the VCC pin of SG6105DZ. So it seemed like a failure with the IC but I tested some more and saw getting 6V for that said VCC pin.
Now comes the unfortunate part
When I was testing these I accidentally shorted 2 main capacitors of the primary.
Then I tested and shocked to see no power to the secondary side.
There is a DM311 in the primary side and I tested that too. It was not getting any voltage for its VCC pin.
Then I tested all the components near that IC. Found an opened 1ohm resistor and I replaced it. But no avail.
So I checked everything in primary side with my digital multi-meter. And found nothing..
Then I decided to replace all ICs of the board. There is another IC labeled as WT7518D near that SG one.
Then I checked and no changes. Then I went desperate and checked all the components which I couldn't check before.
Only things I didn't check were non fusible resistors and small electrolytic capacitors.
I found only 2 components burned. One was C12 5T Zenner diode (went open) near SG6105 and the optocoupler labeled as 817CN (LED side was burned)
I even checked the 3 transformers.
Even after doing all these no changes (Replaced Optocoupler and replaced Zenner diode with a 12V one). No power to transformers and nothing for secondary side.
I had enough and thought to ask from you geeks
PS: I don't have an ESR meter or Capacitance tester. All did using the digital multimeter.
I am attaching pictures of circuit below..
Sorry for the long story and there may be some grammatical errors in my English because I wanted to type fast and let you guys know
Thank you
Frontside 1
Frontside 2
Backside
I came here looking for helps
I saw how you guys helped for PSU repairs. Let me tell you my story I have an Axle typhoon ax-p400l PSU which is 400W but suddenly it stopped working because of a lightning strike which came from Network port.
You may have not heard of this PSU, it's a Chinese made PSU not a high end one like expensive ones over there, but it did me a decent job.
Computer was intact but is PSU dead.
I checked it with my digital multimeter and I saw all the cables have power but it was very low. Like around 2V from 12V cable and etc.. Everything I measured had similar problem. All the pins were around 2V or lower.
So I disassembled the PSU and saw only a 10 ohms resistor was burned but still worked with a burning smell. This resistor is connected to the VCC pin of SG6105DZ. So it seemed like a failure with the IC but I tested some more and saw getting 6V for that said VCC pin.
Now comes the unfortunate part
When I was testing these I accidentally shorted 2 main capacitors of the primary.
Then I tested and shocked to see no power to the secondary side.
There is a DM311 in the primary side and I tested that too. It was not getting any voltage for its VCC pin.
Then I tested all the components near that IC. Found an opened 1ohm resistor and I replaced it. But no avail.
So I checked everything in primary side with my digital multi-meter. And found nothing..
Then I decided to replace all ICs of the board. There is another IC labeled as WT7518D near that SG one.
Then I checked and no changes. Then I went desperate and checked all the components which I couldn't check before.
Only things I didn't check were non fusible resistors and small electrolytic capacitors.
I found only 2 components burned. One was C12 5T Zenner diode (went open) near SG6105 and the optocoupler labeled as 817CN (LED side was burned)
I even checked the 3 transformers.
Even after doing all these no changes (Replaced Optocoupler and replaced Zenner diode with a 12V one). No power to transformers and nothing for secondary side.
I had enough and thought to ask from you geeks
PS: I don't have an ESR meter or Capacitance tester. All did using the digital multimeter.
I am attaching pictures of circuit below..
Sorry for the long story and there may be some grammatical errors in my English because I wanted to type fast and let you guys know
Thank you
Frontside 1
Frontside 2
Backside
Comment